the pentagon has to reduce spending by $46 billion in the remaining seven months of fiscal year 2013. >> if these cuts happen there will be a serious disruption in defense programs and a sharp decline in our military readiness. >> reporter: this army document says three-fourths of its combat brigades will have to delay their training for several months resulting in a failure to meet demands of the national military strategy by the end of this year. afraid it will have to take $18 billion out of its own budget the army has already stopped maintenance of 1,300 vehicles and 17,000 weapons. according to this document the air force would cut its overhauls of aircraft by one-third, with the result that some planes would have to be grounded. flying hours for air force pilots would be cut by 18%. >> it puts at risk our fundamental mission of protecting the american people. >> reporter: combat operations in afghanistan would not be affected by the cuts but the pull-out of $20 billion worth of equipment could be delayed. for "cbs this morning," david martin, the pentagon. >>> it is time to show